Quirky Science - EP. 3

In contrast with popular belief, Edison did not invent the light bulb. Many people contributed to the invention. Mind you, the first lamp was invented around 70,000 BC. Once upon a time we had limelight, which was actually quite unsafe, and then there were arc “arc lamps” – shedding light that blinded movie stars up to the point where they had to wear sunglasses. What Edison did was improve the light bulb to become a practical, affordable and safe product. He tested over 5000 filaments to make the bulb last: from bamboo fiber to a hair out of an assistant’s beard. At the same time others were ... Číst dále